Improved Model-Free Continuous Super-Twisting Non-Singular Fast Terminal Sliding Mode Control of IPMSM
Junqin Liu, Yang Yin, Xiangfei Li, Kaihui Zhao, Zhixuan Yi, Xin Zhou
Abstract
To solve the problem of PI control cannot achieve satisfactory dynamic performance under complex operating conditions, an improved model-free continuous super-twisting non-singular fast terminal sliding mode control (NFTSM) algorithm (IMFSTNFTSMC) for IPMSM based on improved extended higher-order sliding mode disturbance observer (IESMDO) is proposed. Firstly, the speed-current hyperlocal models of IPMSM are developed; Then, the speed-current controllers for IMFSTNFTSMC are designed to optimize the current-speed dual closed-loop; where the jitter of system is effectively attenuated by combining third-order super-twisting with NFTSM; At the same time, IESMDO feeds back the disturbance of the speed and current loops to the controllers, it can effectively improve the performance for system control, and achieve fast-tracking of speed and d-q axis current without overshoot; Finally, the algorithm is experimentally compared with PI and traditional MFNFTSMC to verify that the algorithm effectively improves the dynamic steady-state response and robustness of IPMSM.